Improvement in stone-sawing machines



H'. YOUNG.I Stone-S-awin'g Machine.

Ne. 200,594. Patented Feb. 19, 181s'.

UNITED PATENT[oFF-1cm nnen YOUNG, on-NEw YORK, NQ Yi, A's'sien'on To wiLLiA-M-nknonirr,

oF sAME' PLAGE;

1M pRO'vMENr-j in STONE-SAW* NG MACH NES? Speciiicationforming part of Letters PatentN'o. 200,594, dated February 1 9, 1878*-, application' filed v y 1 ;November 22,1877. j .I v

To altwholn may concern; Y f

lBe it known that I7 HUGH vYOUNGTofthe city, county', and State of New York, have invented an Improvement; in St'one-.Sawing Machines, and I dohereby declare that the following is afull, clear, and exact description of the same, reference being had to the accompanying drawing, forming part of this-specification. -t

My invention relates totht class of stonesawing machines which employreciprocating. saws runningon parallel slides or guideways; and it has A for its obj ects to secure;greatercoml pactness in such machines, andgreater stiffthe saw gate or sash D. .Saidtsawggate or sash is guided in its reciprocation by parallel guides or slides E. Said slides E are attached to' a secondary and movable frame, F, which also carries the crank-shaft G, from which the said sash receives its'reciprocatin g movement through the pitman H. The said secondary frame is suspended from the main frame or support by male screws I, all of which have the same pitch.

In the manner of carrying out my invention shown in the drawing, said secondaryframe is guided by ways K, formed upon the main frame or support, and by the pillar L; but any other means or arrangement of parts for guiding the vertical motion of the secondary frame may be adopted. The male screws I are fitted into female screws in or on the said secondary frame, and each of said male screws has attached to it a bevel-gear, m. Said bevel-gears m mesh with bevel-bears m', keyed to the horizontal shafts N, which have bearingsin suitable boxes upon the top of the principalframe A. Said shafts N have also keyed to them bevel-gears m, which mesh with the beveled i gears m/ keyed to" the shaftlN Thebeveled `gearsmhave each the same number ofteeth.A The beveled` gears m haveeach-the same num;

ber-of teeth also. 4 Likewise the beveled gears. mf have each the same number lof teeth, and

' the beveled gears m', keyed to the shaft N', ,have each thezsame number of teeth. It-fol- 1 lowsthatany motion of the shaftN! must impart an equal motion to the shafts N, andfalso an equal vmotion tothe screws I,yand that the secondary frame F must be uniformly and;

,equallylifted Yor lowered in .allits .parts by such motion of theshaft NC f I' do Ilot: confine @myself to the precise ymeans described for raising, and lowering fthe secondary frame -Fr- /Other vmeansfmay be adoptedforzthe saine purpOSe, yit being only vf essential that the said secondary frame should Vbe raisedv equally and uniformly ina-ll' itsparts.y N either -do -I conne myself to 1, ani integral secondary framefor' carrying-both the crankshaft and sash.. The saidffframe may bevdif vided. into separate .frames for .carrying the' f sash-slides andthecrank-shaft,it. being only -essential'that the framingwhich carries the several sash-slides and the crankshaftwhether vin oueor in separate parts, be v raised or lowered, or moved to and from the stone to be cut, uniformly in all its parts, in order that the said crank-shaft may always maintain a constant relation with the slides E, that guide the reciprocation of the sash. This feature of maintaining a xed relation between the said crank-shaft and slides E secures the great advantage that a very short pitman may be employed for connecting the said crank-shaft with the said sash, thus enabling me, in actual practice, to shorten the machine more than one-third of the length heretofore required, and to lessen the powerl and repairs needed, a long pitman having been heretofore required by the feeding up and down of the said saw and sash, which necessitated great length in the machine, and caused great strain on the parts of the same. Moreover, by the shortening of the machine, I am enabled to place the whole machine on a single bed-plate or foundation, which was heretofore impracticable, and thus can secure a permanent alignment of the parts.

I impart motion to the shaft N by means of a ratchet-wheel and pawl, O, which derives its e imparting motion to the said shaft N', as vat rious devices may effect the same purpose.

In further carrying out my invention, I place upon the back of the saw a detachable bar or stiifening -back, R. Said stiffening-back is grooved on its inner side to admit the back margin of the said saw, and when placed upon the said saw it may be held in place by plates r, Fig. l, resting upon the extremities of said bar, and bolted to the inner sides of the end pieces of the sash.` Said bar is employed to stii'en the saw G for the short periodwhi le it is commencing to cut its kerf in the stone,and may be detached after the said kerf hasbeen accurately started, if the cut is to lbe deeper than the width of the saw-blade below said stiffening-back. f

In another way of carrying out this feature of my invention, I attach to the inner sides of the end pieces of the sash the supports R', Figs. 2 and 3. Said supports are so formed as to'provide a ledge, S, Fig. 3, for the support of the ends of the stiifening-backV R, and also to provide projections T, Figs. 2 and 3, which hold the said stiiiening-back from lateral movement. Said supports serve to keep the stiii'eningback in such relation with the blade as to permit a free working of the blade in the groove of the stiifening-back, when the blade has a push or lift motion imparted to it. In such case it is desirable that the groove in the stiiening-backbeofsuch depth and the ledges in such position that the push or lift of the blade shall neither disturb the support of the stiffening-back on the ledges S, nor carry the blade out of the groove. The stiii'ening-back may rest on the middle part of the saw-blade; but, by reason of its flexibility, it yields to the vpush or lift motion 'of said bladewithoutdisturbing its bearings on the ledges S. 1

I claimy 1. The combination, in a stone-sawing machine, of a fixed main frame or support and movable framing, which carries parallel guides `or slides for directing the reciprocation of the saw-gate, and which also carries the bearings for the shaft for driving the said saw-gate, and which' is adjustable in a direction perpendicular to the stroke of thesaw, whereby the said shaft and said guides or slides are always maintained in a fixed relation with each other in said adjustable framing, substantially as and for the purpose described. v

2. The combination, in a stone-sawing ma chine, of a fixed main frame or support, movable framing, which contains parallel guides or slides for the saw-gate, and bearings for the shaft which drives the saw, and automatic means for moving the saidrmovable framing, shaft, guides, and saw together, for the purpose of feeding the saw to the work, substantially as and for the purpose set forth.

3. Ihe combination, with the movable fram;V

ing, holding in fixed relation the parallel guides for the saw-'gate l), and the bearings for the shaft G, which drives the saw, of a system of male screws, I, of equal pitch,-fitted tofemale l screws in -said frame, supported in bearings on the main frame or support, and actuated equally and uniformly by a system of bevel- `gearing-and shafts through a ratchet-andpawl movement driven by the said shaft G,

vsubstantially as and for the purpose specied. 4. The combination, with the saw-blade, of

thev detachable widening-back, constructed and appliedsubstantially as and for the purpose specified. i y

' y' HUGH YOUNG.

Witnesses:

FRED. HAYNES,

EDWARD B. SPERRY. 

